Javascript if-else statement not working [duplicate]

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Give == instead of =

var a = function(){
    console.log('fn starts');
    var b = 1;
    for (var i = 0; i <3; i++) {
        if(b==1){// must be double equal to
            b+=1;
            console.log("if"+i);
        } else {
            console.log("else"+i);
        }
    }
}
<input type="submit" onclick="a()"></div>

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